shared_pref1

yudiwibisono

Jun 3rd, 2023

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//dependencies:
// shared_preferences: ^2.1.1
import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatefulWidget {
const MyApp({Key? key}) : super(key: key);
@override
State<MyApp> createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
late Future<String> userId;
//ambil dari sharedpref
//return userId
Future<String> ambilDataUser() async {
final prefs = await SharedPreferences.getInstance();
return (prefs.getString('userId') ?? "");
}
//simpan ke sharepref
Future<void> simpanDataUser() async {
final prefs = await SharedPreferences.getInstance();
await prefs.setString('userId', "budiWati");
}
//hapus data sharedpref
Future<void> hapusDataUser() async {
final prefs = await SharedPreferences.getInstance();
await prefs.remove('userId');
}
@override
void initState() {
super.initState();
userId = ambilDataUser(); //isi userid
}
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
body: Center(
child: FutureBuilder<String>(
future: userId,
builder: (context, snapshot) {
if (snapshot.hasData) {
//user id belum ada di sharedpref
if (snapshot.data == "") {
return (Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Text("user belum login"),
ElevatedButton(
onPressed: () {
setState(() {
//set userid (simulasi)
//simpan ke sharedpref
//sekaligus refresh
simpanDataUser();
userId = ambilDataUser();
}); //refresh
},
child: const Text('Login'),
),
]));
} else {
//sudah ada datauser di sharedpref
return (Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Text("userid: ${snapshot.data!}"),
ElevatedButton(
onPressed: () {
setState(() {
//hapus sharedpref
//sekaligus refresh
hapusDataUser();
userId = ambilDataUser();
}); //refresh
},
child: const Text('Logout'),
),
]));
}
} else {
return const CircularProgressIndicator();
}
})),
),
);
}
}

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